Control method of micro-grid park system and micro-grid park system

Abstract

The invention discloses a control method of a micro-grid park system and the micro-grid park system, and relates to the technical field of energy dispatching. The control method of the microgrid park system comprises the steps that a first time period type corresponding to the current moment is determined, and the first time period type comprises a valley time period, a normal time period, a peak time period and a peak time period; the current operation state of a first energy storage converter in the N energy storage converters and the first electric quantity of a first battery connected with the first energy storage converter are obtained, and the operation state comprises a power-on state and a power-off state; according to the first time period type, the current operation state of the first energy storage converter and the first electric quantity, the operation state of the first energy storage converter is adjusted, and the charging process or the discharging process of the first battery is adjusted. Through the above mode, the energy can be deployed in combination with the actual operation state of the micro-grid park system, so that the energy in the micro-grid park system can be utilized more effectively.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of energy scheduling technology, and in particular to a control method for a microgrid park system and a microgrid park system. Background Art

[0002] The industrial and commercial photovoltaic storage microgrid system is an intelligent microgrid system that integrates photovoltaic power generation systems, energy storage systems, loads, and interactions with the power grid. It mainly includes scenarios such as factories and commercial complexes.

[0003] At present, in industrial and commercial photovoltaic storage microgrid systems, the energy storage system is usually only configured to charge during valley hours and discharge during peak hours or peak hours to improve energy utilization. However, the utilization rate of this method is still low. Summary of the invention

[0004] The embodiments of the present application provide a control method for a microgrid park system and a microgrid park system, which can allocate energy in combination with the actual operation of the microgrid park system to achieve more efficient use of energy in the microgrid park system.

[0005] In a first aspect, an embodiment of the present application provides a control method for a microgrid park system, wherein the microgrid park system includes an energy storage system and a load, wherein the energy storage system includes at least one energy storage unit, wherein the energy storage unit is connected to the load, and wherein the energy storage unit includes N energy storage converters and N batteries, wherein each of the energy storage converters is connected to one of the batteries, wherein N is an integer greater than or equal to 1, and wherein the method includes:

[0006] Determine a first time period type corresponding to the current moment, wherein the first time period type includes a valley time period, a normal time period, a peak time period, and a peak time period;

[0007] Obtaining a current operating state of a first energy storage converter among the N energy storage converters and a first power level of a first battery connected to the first energy storage converter, wherein the operating state includes a power-on state and a power-off state;

[0008] According to the first time period type, the current operating state of the first energy storage inverter and the first electrical quantity, the operating state of the first energy storage inverter is adjusted, and the charging process or the discharging process of the first battery is adjusted.

[0009] In one or more embodiments, before determining the first time period type corresponding to the current moment, the method further includes: receiving system configuration parameters, wherein the system configuration parameters include time periods corresponding to each time period type, whether the first battery is allowed to charge or discharge, and whether the operating state of the first energy storage converter is allowed to be switched to a shutdown state;

[0010] The determining the first time period type corresponding to the current moment includes: determining the first time period type corresponding to the current moment according to the system configuration parameter;

[0011] The step of adjusting the operating state of the first energy storage inverter and the charging process or discharging process of the first battery according to the first time period type, the current operating state of the first energy storage inverter and the first power includes:

[0012] Determine the remaining duration of the first time period type and a second time period type, wherein the second time period type is the next time period type after the first time period type ends;

[0013] When the first time period type is the valley time period or the normal time period, determining the upper limit value of the amount of electricity charged by the first battery connected to the first energy storage inverter based on the system configuration parameters, and adjusting the operating state of the first energy storage inverter and the charging process of the first battery according to the system configuration parameters, the second time period type, the current operating state of the first energy storage inverter, the first amount of electricity, the upper limit value of the amount of electricity, and the remaining time;

[0014] When the first time period type is the peak time period or the spike time period, determine the first lower limit value and the second lower limit value of the first battery discharge, and adjust the operating state of the first energy storage inverter and the discharge process of the first battery according to the system configuration parameters, the second time period type, the current operating state of the first energy storage inverter, the first power, the first lower limit value, the second lower limit value and the remaining time, wherein the first lower limit value of the power is determined based on the system configuration parameters, and the second lower limit value of the power is the sum of the first lower limit value of the power and the preset power value.

[0015] In one or more embodiments, adjusting the operating state of the first energy storage inverter and the charging process of the first battery according to the system configuration parameters, the second time period type, the current operating state of the first energy storage inverter, the first power, the power upper limit value and the remaining time includes:

[0016] When the first time period type is the valley time period, and the current operating state of the first energy storage converter is the shutdown state, the following steps are performed:

[0017] If any one of condition 2 and condition 3 is satisfied while condition 1 is satisfied, or if condition 4 is satisfied while condition 1 is not satisfied, adjusting the first energy storage converter to switch to the power-on state;

[0018] If condition 1 is met but condition 2 and condition 3 are not met, controlling the operating state of the first energy storage converter to remain in the shutdown state;

[0019] Among them, condition 1: the remaining time is less than the preset time;

[0020] Condition 2: the second time period type is the peak time period or the peak time period;

[0021] Condition three: the second time period type is the normal time period during which the first battery is allowed to be charged, determined based on the system configuration parameters;

[0022] Condition 4: the first power level is less than the power upper limit.

[0023] In one or more embodiments, adjusting the operating state of the first energy storage inverter and the charging process of the first battery according to the system configuration parameters, the second time period type, the current operating state of the first energy storage inverter, the first power, the power upper limit value and the remaining time includes:

[0024] When the first time period type is the valley time period, and the current operating state of the first energy storage converter is the power-on state, the following steps are performed:

[0025] If condition five is satisfied, or if condition five is not satisfied and condition six is ​​satisfied and any one of condition seven and condition eight is satisfied, then when the power of the first energy storage converter is not zero, the power is adjusted to zero, and after the power is zero, the operating state of the first energy storage converter is adjusted according to the system configuration parameters;

[0026] If both condition 5 and condition 6 are not satisfied, controlling the first battery to charge;

[0027] Among them, condition five, the first power is greater than the power upper limit value or the first power is within a first preset interval, wherein the first preset interval is a power interval with the power upper limit value as the center point and the left and right endpoints symmetrical relative to the center point;

[0028] Condition 6: the remaining duration is less than the preset duration;

[0029] Condition 7: The second time period type is a normal time period during which the first battery is not allowed to be charged and the first energy storage converter is allowed to stop operating, determined based on the system configuration parameters;

[0030] Condition eight: the second time period type is the peak time period or the peak time period.

[0031] In one or more embodiments, adjusting the operating state of the first energy storage inverter and the charging process of the first battery according to the system configuration parameters, the second time period type, the current operating state of the first energy storage inverter, the first power, the power upper limit value and the remaining time includes:

[0032] When the first time period type is the normal time period, and the current operating state of the first energy storage converter is the shutdown state, the following steps are performed:

[0033] If condition nine and condition ten are satisfied at the same time, or condition ten and condition eleven are not satisfied at the same time, adjusting the first energy storage converter to switch to the power-on state;

[0034] If condition 11 is met while condition 10 is not met, controlling the operating state of the first energy storage converter to remain in the shutdown state;

[0035] Among them, condition nine: determining to allow the first battery to charge based on the system configuration parameters;

[0036] Condition 10: the first power level is less than the power upper limit;

[0037] Condition 11: The remaining duration is greater than or equal to the preset duration.

[0038] In one or more embodiments, adjusting the operating state of the first energy storage inverter and the charging process of the first battery according to the system configuration parameters, the second time period type, the current operating state of the first energy storage inverter, the first power, the power upper limit value and the remaining time includes:

[0039] When the first time period type is the normal time period, and the current operating state of the first energy storage converter is the power-on state, the following steps are performed:

[0040] If condition 12 is not satisfied, or condition 12 and condition 13 are satisfied at the same time, when the power of the first energy storage converter is not zero, the power is adjusted to zero, and after the power is zero, the operating state of the first energy storage converter is adjusted according to the system configuration parameters;

[0041] If condition 12 is met but condition 13 is not met, controlling the first battery to charge;

[0042] Condition 12: determining to allow charging of the first battery based on the system configuration parameters;

[0043] Condition 13: the first power level is greater than the power upper limit or the first power level is within a first preset range.

[0044] In one or more embodiments, the system configuration parameters also include a charging power upper limit, a charging power adjustment step, and a total power upper limit of the microgrid park system;

[0045] The controlling the charging of the first battery comprises:

[0046] Determine a first target charging power of the first energy storage inverter according to the rated power of the first battery, the remaining time, the first power and the power upper limit;

[0047] limiting the target charging power according to the charging power upper limit and the total power upper limit, and limiting the power adjustment amount according to the charging power adjustment step, so as to determine a second target charging power;

[0048] If condition fourteen, condition fifteen and condition sixteen are not met at the same time, the charging power of the first energy storage inverter is adjusted according to the first target adjustment amount, and the first battery is charged by the first energy storage inverter, wherein the first target adjustment amount is the difference between the second target charging power and the current power of the first energy storage inverter;

[0049] Among them, condition fourteen: the absolute value of the first target adjustment amount is less than the first preset adjustment range;

[0050] Condition 15: the second target charging power is greater than or equal to the current power, and the active power increase locking function of the energy storage system is triggered;

[0051] Condition 16: the second target charging power is less than the current power, and the active power reduction locking function of the energy storage system is triggered.

[0052] In one or more embodiments, adjusting the operating state of the first energy storage inverter and the discharge process of the first battery according to the system configuration parameters, the second time period type, the current operating state of the first energy storage inverter, the first power, the first power lower limit, the second power lower limit and the remaining time includes:

[0053] When the first time period type is the peak time period, and the current operating state of the first energy storage converter is the shutdown state, the following steps are performed:

[0054] If condition 17 is satisfied, or condition 18, condition 19 and condition 20 are satisfied at the same time, or if condition 17 and condition 18 are not satisfied but condition 19 is satisfied and any one of condition 20 and condition 21 is satisfied, then the first energy storage converter is adjusted to switch to the power-on state;

[0055] If at least one of condition 19 and condition 20 is not satisfied while condition 18 is satisfied, or condition 17, condition 18 and condition 19 are not satisfied at the same time, or condition 17, condition 18, condition 20 and condition 21 are not satisfied at the same time, then the first energy storage converter is controlled to remain in the shutdown state;

[0056] Among them, condition seventeen, the first power is greater than the lower limit of the second power;

[0057] Condition 18: the first power level is less than or equal to the first power level lower limit;

[0058] Condition 19: the remaining time is less than the preset time;

[0059] Condition 20: the second time period type is the valley time period or the normal time period during which the first battery is allowed to be charged, determined based on the system configuration parameters;

[0060] Condition 21: The second time period type is the peak time period.

[0061] In one or more embodiments, adjusting the operating state of the first energy storage inverter and the discharge process of the first battery according to the system configuration parameters, the second time period type, the current operating state of the first energy storage inverter, the first power, the first power lower limit, the second power lower limit and the remaining time includes:

[0062] When the first time period type is the peak time period, and the current operating state of the first energy storage converter is the startup state, the following steps are performed:

[0063] If condition 22 is satisfied, or condition 25 is satisfied while condition 22, condition 23 and condition 24 are not satisfied, then when the power of the first energy storage converter is not zero, the power is adjusted to zero, and after the power is zero, the operating state of the first energy storage converter is adjusted according to the system configuration parameters;

[0064] If condition 23 is met while condition 22 is not met, the power is controlled to remain unchanged;

[0065] If condition 22, condition 23, condition 24, condition 25 and condition 26 are not met at the same time, when the power of the first energy storage converter is not zero, reducing the power;

[0066] If condition 26 is met while condition 22, condition 23 and condition 24 are not met, controlling the first battery to discharge;

[0067] Among them, condition 22, the first power is less than the second power lower limit, or the first power is within a second preset interval, wherein the second preset interval is a power interval with the second power lower limit as the center point and the left and right endpoints symmetrical relative to the center point;

[0068] Condition 23: The next moment is in the peak period;

[0069] Condition 24: the second time period type is the peak time period;

[0070] Condition 25: The remaining time is equal to the time for adjusting the power to zero;

[0071] Condition 26: The remaining time is greater than the time required to adjust the power to zero.

[0072] In one or more embodiments, the system configuration parameters further include a discharge power lower limit and a discharge power adjustment step, and the first time period type is the peak time period;

[0073] The controlling the first battery to discharge comprises:

[0074] Determine a first target discharge power of the first energy storage converter according to the rated power of the first battery, the remaining time, the first power and the lower limit of the second power;

[0075] limiting the first target discharge power according to the discharge power lower limit, limiting the power adjustment amount according to the discharge power adjustment step, and configuring the sum of the power of the load and the first target discharge power to be greater than zero, so as to determine the second target discharge power;

[0076] If condition 27, condition 28 and condition 29 are not met at the same time, the discharge power of the first energy storage converter is adjusted according to the second target adjustment amount, and the discharge of the first battery is controlled by the first energy storage converter, wherein the second target adjustment amount is the difference between the second target discharge power and the current power of the first energy storage converter;

[0077] Among them, condition 27: the absolute value of the second target adjustment amount is less than the second preset adjustment range;

[0078] Condition 28: The second target discharge power is greater than or equal to the current power, and the active power increase locking function of the energy storage system is triggered;

[0079] Condition 29: The second target regulated power is less than the current power, and the active power reduction locking function of the energy storage system is triggered.

[0080] In one or more embodiments, adjusting the operating state of the first energy storage inverter and the discharge process of the first battery according to the system configuration parameters, the second time period type, the current operating state of the first energy storage inverter, the first power, the first power lower limit, the second power lower limit and the remaining time includes:

[0081] When the first time period type is the peak time period, and the current operating state of the first energy storage converter is the shutdown state, the following steps are performed:

[0082] If condition 30 is satisfied, or if condition 31 and condition 32 are satisfied while condition 30 is not satisfied, adjusting the first energy storage converter to switch to the power-on state;

[0083] If at least one of condition 31 and condition 32 is not satisfied while condition 30 is not satisfied, controlling the first energy storage converter to remain in the shutdown state;

[0084] Among them, condition 30: the first power is greater than the first power lower limit;

[0085] Condition 31: the remaining duration is less than the preset duration;

[0086] Condition 32: The second time period type is the valley period or the normal period during which the first battery is allowed to charge based on the system configuration parameters.

[0087] In one or more embodiments, adjusting the operating state of the first energy storage inverter and the discharge process of the first battery according to the system configuration parameters, the second time period type, the current operating state of the first energy storage inverter, the first power, the first power lower limit, the second power lower limit and the remaining time includes:

[0088] When the first time period type is the peak time period, and the current operating state of the first energy storage converter is the power-on state, the following steps are performed:

[0089] If condition thirty-three is satisfied, or condition thirty-three, condition thirty-four and condition thirty-five are not satisfied and condition thirty-six is ​​satisfied, then when the power of the first energy storage converter is not zero, the power is adjusted to zero, and after the power is zero, the operating state of the first energy storage converter is adjusted according to the system configuration parameters;

[0090] If condition 34 is met while condition 33 is not met, the power is controlled to remain unchanged;

[0091] If condition 33, condition 34, condition 35, condition 36 and condition 37 are not satisfied at the same time, when the power of the first energy storage converter is not zero, reducing the power;

[0092] If condition 37 is met while condition 33, condition 34 and condition 35 are not met, controlling the first battery to discharge;

[0093] Among them, condition thirty-three, the first power is less than the first power lower limit, or the first power is within a third preset interval, wherein the third preset interval is a power interval with the first power lower limit as the center point and the left and right endpoints symmetrical relative to the center point;

[0094] Condition 34: The next moment is in the peak period;

[0095] Condition 35: the second time period type is the peak time period;

[0096] Condition 36: The remaining time is equal to the time for adjusting the power to zero;

[0097] Condition 37: The remaining duration is greater than the duration for adjusting the power to zero.

[0098] In one or more embodiments, the system configuration parameters further include a discharge power lower limit and a discharge power adjustment step, and the first time period type is the peak time period;

[0099] The controlling the first battery to discharge comprises:

[0100] Determine a third target discharge power of the first energy storage converter according to the rated power of the first battery, the remaining time, the first power and the first power lower limit;

[0101] The third target discharge power is limited according to the discharge power lower limit, and the power adjustment amount is limited according to the discharge power adjustment step, and the sum of the power of the load and the third target discharge power is configured to be greater than zero, so as to determine a fourth target discharge power;

[0102] If condition 38, condition 39 and condition 40 are not met at the same time, the discharge power of the first energy storage inverter is adjusted according to the third target adjustment amount, and the discharge of the first battery is controlled by the first energy storage inverter, wherein the third target adjustment amount is the difference between the fourth target adjustment power and the current power of the first energy storage inverter:

[0103] Among them, condition 38: the absolute value of the third target adjustment amount is less than the third preset adjustment interval;

[0104] Condition 39: the fourth target regulated power is greater than or equal to the current power, and the active power increase locking function of the energy storage system is triggered;

[0105] Condition 40: the fourth target regulated power is less than the current power, and the active power reduction locking function of the energy storage system is triggered.

[0106] In a second aspect, an embodiment of the present application provides a microgrid park system, including an energy management system, an energy storage system and a load;

[0107] The energy storage system includes at least one energy storage unit, the energy storage unit is connected to the load, the energy storage unit includes N energy storage converters and N batteries, each of the energy storage converters is connected to one of the batteries, wherein N is an integer greater than or equal to 1;

[0108] The energy management system is connected to the energy storage system, and the energy management system is used to execute the control method of the microgrid park system as described above.

[0109] The beneficial effect of the present application is that the control method of the microgrid park system of the embodiment of the present application includes: determining the first time period type corresponding to the current moment, the first time period type includes valley time period, normal time period, peak time period and peak time period; obtaining the current operating state of the first energy storage converter among the N energy storage converters and the first power of the first battery connected to the first energy storage converter, wherein the operating state includes the power-on state and the power-off state; adjusting the operating state of the first energy storage converter according to the first time period type, the current operating state of the first energy storage converter and the first power, and adjusting the charging process or discharging process of the first battery. In the above process, the microgrid park system is controlled accordingly by combining the time period type and the actual operating state of the components in the microgrid park system, such as the charging and discharging state of the first battery and the operating state of the first energy storage converter. Thus, it is possible to allocate energy in combination with the actual operating state of the microgrid park system to achieve more efficient use of energy in the microgrid park system. BRIEF DESCRIPTION OF THE DRAWINGS

[0110] One or more embodiments are exemplarily described by the figures in the corresponding drawings, and these exemplary descriptions are not intended to limit the embodiments. Elements with the same reference numerals in the drawings represent similar elements.

[0111] Figure 1 It is a structural diagram of a microgrid park system provided in an embodiment of the present application;

[0112] Figure 2 This is the process of the control method of the microgrid park system provided in the embodiment of the present application Figure 1 ;

[0113] Figure 3 This is the process of the control method of the microgrid park system provided in the embodiment of the present application Figure 2 ;

[0114] Figure 4 The embodiment of this application provides Figure 3 A schematic diagram of a first implementation of step 233 shown in FIG.

[0115] Figure 5 The embodiment of this application provides Figure 3 A schematic diagram of a second implementation of step 233 shown in FIG.

[0116] Figure 6 The embodiment of this application provides Figure 5 Step 55 or Figure 8 A schematic diagram of an embodiment of step 84 shown in FIG.

[0117] Figure 7 The embodiment of this application provides Figure 3 A schematic diagram of a third implementation of step 233 shown in FIG.

[0118] Figure 8 The embodiment of this application provides Figure 3 A schematic diagram of a fourth implementation of step 233 shown in FIG.

[0119] Fig. 9 The embodiment of this application provides Figure 3 A schematic diagram of a first implementation of step 235 is shown in FIG.

[0120] Fig.10 The embodiment of this application provides Figure 3 A schematic diagram of a second implementation of step 235 shown in FIG.

[0121] Fig.11 The embodiment of this application provides Fig.10 A schematic diagram of an embodiment of step 110 shown in FIG.

[0122] Fig.12 The embodiment of this application provides Figure 3 A schematic diagram of a third embodiment of step 235 shown in FIG.

[0123] Fig.13 The embodiment of this application provides Figure 3 A schematic diagram of a fourth embodiment of step 235 shown in FIG.

[0124] Fig.14 The embodiment of this application provides Fig.13 A schematic diagram of one implementation of step 140 is shown in FIG. DETAILED DESCRIPTION

[0125] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and in detail in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0126] It should be noted that, when an element is described as being “connected to” another element, it may be directly connected to the other element, or one or more intervening elements may exist therebetween.

[0127] In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as there is no structural conflict between them.

[0128] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of the microgrid park system provided in the embodiment of the present application. Figure 1 As shown, the microgrid park system 1000 includes an energy storage system 100 , an energy management system 200 and a load 300 .

[0129] The energy storage system 100 includes at least one energy storage unit 10, each energy storage unit 10 is connected to the load 300, any energy storage unit 10 includes N energy storage converters and N batteries, each energy storage converter is electrically connected to a battery, wherein N is an integer greater than or equal to 1, usually 1 or 2. In this embodiment, the energy storage system 100 includes one energy storage unit (the first energy storage unit 10), and the first energy storage unit 10 includes one energy storage converter (the first energy storage converter 11) and one battery (the first battery 12) as an example (i.e., N=1).

[0130] The first energy storage converter (Power Convers i on System, PCS) 11 can control the energy conversion between the first battery 12 and the power grid, and control the energy conversion between the first battery 12 and the load 300. Specifically, when the first energy storage converter 11 operates in charging mode, it can convert the alternating current (AC) of the power grid into direct current (DC) for charging the battery. When the first energy storage converter 11 operates in discharge mode, it can convert the direct current (DC) of the battery into alternating current (AC) for transmitting electric energy to the power grid or directly for use by the load. The first battery 12 includes a plurality of parallel, series or mixed battery cells for storing and providing electric energy, and the mixed connection includes series and parallel.

[0131] In some embodiments, any energy storage unit 10 further includes N battery management systems, each of which is connected to a battery. The battery management system can manage the charging and / or discharging of the battery connected thereto, and can also be used to monitor, manage and protect the performance and safety of the battery. In this embodiment, taking the first energy storage unit 10 including a battery management system (the first battery management system 13) as an example, the first battery management system 13 can manage the charging and / or discharging of the first battery 12, and can also be used to monitor, manage and protect the performance and safety of the first battery 12.

[0132] In some embodiments, any energy storage unit 10 also includes a box-type substation. Each box-type substation is electrically connected to N energy storage converters. A box-type substation (Box-type Substation or Contai ner i ned Substation) is a prefabricated, integrated substation that integrates transformers, switchgear, protection devices and other related electrical equipment in one or several prefabricated boxes. In this embodiment, the first energy storage unit 10 includes a box-type substation (the first box-type substation 14), and the first box-type substation 14 is connected to an energy storage converter (i.e., the first energy storage converter 11) as an example.

[0133] The energy management system 200 is connected to the energy storage system 100 in communication. The energy management system (EMS) 200 is responsible for the collection, processing and storage of energy data of the energy storage system 100, and can execute the control method of the microgrid park system 1000 in any embodiment of the present application. The energy management system 200 is connected to the energy storage converter, the battery management system and the box-type substation through communication protocols such as Modbus-TCP and IEC104. In this embodiment, the energy management system 200 is connected to the first energy storage converter 11, the first battery management system 13 and the first box-type substation 14 in communication as an example. The energy management system 200 can adjust the operating state of the first energy storage converter 11 (including the power-on state and the power-off state) and adjust the charging power and target power of the first energy storage converter 11 to control the charging process and discharging process of the first battery 12. The energy management system 200 can also obtain relevant information such as the power of the first battery 12 through the first battery management system 13.

[0134] It should be noted that, in this embodiment, the energy management system 200 controls the first energy storage inverter 11 and the first battery 12 to realize the energy allocation process as an example. As for other energy storage inverters and batteries in the microgrid park system 1000, the control method adopted by the energy management system 200 is the same as the control method adopted for controlling the first energy storage inverter 11 and the first battery 12, and will not be repeated. For example, in some embodiments, the energy storage system 100 also includes a second energy storage inverter and a second battery electrically connected thereto, then the energy management system 200 controls the second energy storage inverter and the second battery in the same manner as the first energy storage inverter 11 and the first battery 12.

[0135] In one embodiment, the microgrid park system 1000 also includes an inverter 400 and a photovoltaic module 500. The inverter 400 is used to convert direct current into alternating current. The photovoltaic module 500, also known as a solar panel, is the core part of a solar power generation system. It is formed by connecting a plurality of single solar cells in series and in parallel, and is packaged and protected. The photovoltaic module 500 can convert solar energy into electrical energy, usually into direct current, and then convert it into alternating current through the inverter 400.

[0136] It should be noted that if Figure 1 The structure of the microgrid campus system 1000 shown is only an example, and the microgrid campus system 1000 may have more or fewer components than those shown in the figure, may combine two or more components, or may have a different component configuration. The various components shown in the figure may be implemented in hardware, software, or a combination of hardware and software including one or more signal processing and / or application-specific integrated circuits.

[0137] For example, in some embodiments, the microgrid park system 1000 further includes a voltage transformer. A voltage transformer (VT or PT) is a device used to measure and protect high-voltage power systems. It can convert high-voltage signals into low-voltage signals to facilitate the safe use of measuring instruments, relays and other equipment.

[0138] At present, for industrial and commercial photovoltaic storage microgrid systems, the energy storage system is usually only configured to charge during valley hours and discharge during peak hours or peak hours to improve energy utilization. However, the utilization rate of this method is still low.

[0139] Based on this, an embodiment of the present application provides a control method for a microgrid park system, which can allocate energy based on the actual operating conditions of the microgrid park system (such as the actual operating conditions of the energy storage inverter and the battery), thereby achieving more efficient use of the energy in the microgrid park system, that is, improving the energy utilization rate.

[0140] Please refer to Figure 2 , Figure 2 A flow chart of a control method for a microgrid park system provided in an embodiment of the present application. The microgrid park system includes an energy storage system and a load, the energy storage system includes at least one energy storage unit, the energy storage unit is connected to the load, the energy storage unit includes N energy storage converters and N batteries, each energy storage converter is connected to a battery, wherein N is an integer greater than or equal to 1. In some embodiments, the microgrid park system can be controlled by Figure 1 The structure shown in the figure is implemented. The specific implementation process has been described in detail in the above embodiment and will not be repeated here. Figure 1 The structure shown in the figure is used as an example to illustrate. Figure 2 As shown, the control method of the microgrid park system includes the following steps:

[0141] Step 21: Determine the first time period type corresponding to the current moment, wherein the first time period type includes a valley period, a normal period, a peak period, and a peak period.

[0142] Among them, valley period, normal period, peak period and peak period are concepts used in the power system to describe the electricity demand and pricing strategy in different time periods of the day. Valley period (Low Valley or Off-Peak) is the period with the lowest electricity consumption, which usually occurs at night or early morning, and the electricity price in valley period is usually the lowest to encourage users to use more electricity during these periods. Normal period (Shoulder or Mid-Peak) is between valley period and peak period, and the electricity consumption is relatively stable. The electricity price in this period is usually between valley period and peak period. The specific time of normal period may vary from region to region, but it usually includes daytime working hours and non-peak time in the evening. Peak period (Peak) is the period with higher electricity demand, which usually occurs during working hours or evening hours on weekdays. Super Peak (Super Peak or Critical Peak) is the moment when electricity demand is highest, which usually occurs on very hot or very cold days.

[0143] The specific time division of the four time periods of valley period, normal period, peak period and peak period may vary according to the policies of power companies in different regions and seasonal changes. For example, in some embodiments, the valley period is generally from 11 pm to 7 am the next day; the normal period is, for example, from 7 am to 10 am, and from 4 pm to 11 pm; the peak period is generally from 8 am to 10 am, and from 4 pm to 9 pm; the peak period may be from 4 pm to 7 pm or a shorter time period.

[0144] For the specific time division of the four time periods, namely, off-peak period, normal period, peak period and peak period, users can pre-set it based on the actual application scenario and Figure 1 The energy management system 200 shown in the figure obtains to determine the first time period type corresponding to the current time. For example, assuming that the current time is 12 o'clock in the evening, and assuming that the preset valley time period is 11 o'clock in the evening to 7 o'clock in the morning of the next day, then the first time period type corresponding to the current time is the valley time period.

[0145] Step 22: Acquire the current operating state of a first energy storage inverter among the N energy storage inverters and the first power level of a first battery connected to the first energy storage inverter, wherein the operating state includes a power-on state and a power-off state.

[0146] The first energy storage inverter 11 is any one of the N energy storage inverters. The first electric quantity is the electric quantity of the first battery 12. The energy management system 200 can adjust the operating state of the first energy storage inverter 11. When the energy management system 200 adjusts the operating state of the first energy storage inverter 11 to the power-on state, the first battery 12 can be charged or discharged, and the energy management system 200 can adjust the charging power or discharging power of the first energy storage inverter 11 to adjust the charging process or discharging process of the first battery 12; when the energy management system 200 adjusts the operating state of the first energy storage inverter 11 to the power-off state, the first battery 12 is neither charged nor discharged.

[0147] Step 23: According to the first time period type, the current operating state of the first energy storage inverter and the first power, the operating state of the first energy storage inverter is adjusted, and the charging process or the discharging process of the first battery is adjusted.

[0148] By combining the time period type and the actual operating status of the elements related to energy transmission in the microgrid park system 1000, such as the charging and discharging status and power of the first battery 12, the operating status of the first energy storage converter 11, etc., the microgrid park system 1000 is controlled accordingly. Therefore, it is possible to allocate energy in combination with the actual operating status of the microgrid park system 1000. Compared with the method in the related art that only configures the energy storage system to charge in the valley period and discharge in the peak period or the spike period, the embodiment of the present application can achieve more effective utilization of the energy in the microgrid park system 1000, which is conducive to improving the utilization rate of energy.

[0149] It should be noted that any of the N energy storage converters can be used as the first energy storage converter. In other words, the control process for each energy storage converter is the same. Similarly, the control process for each battery is also the same. For example, in some embodiments, N=2, and the N energy storage converters include energy storage converter A1 and energy storage converter A2. Correspondingly, the battery B1 is connected to the energy storage converter A1, and the battery B2 is connected to the energy storage converter A2. Then, the control process for the energy storage converter A1 and the battery B1 is the same as the control process for the energy storage converter A2 and the battery B2. As described above, for other energy storage converters and batteries in the microgrid park system 1000, the control method adopted by the energy management system 200 is the same as the control method adopted for controlling the first energy storage converter 11 and the first battery 12. The subsequent embodiments only describe the control process of the first energy storage converter 11 and the first battery 12.

[0150] In one embodiment, if Figure 3 As shown, before executing step 21, step 31 is also executed: receiving system configuration parameters.

[0151] Among them, the system configuration parameters include the time periods corresponding to each time period type (i.e., the specific time division of the four time periods of valley period, normal period, peak period and peak period), whether the first battery 12 is allowed to charge or discharge, and whether the operating state of the first energy storage inverter 11 is allowed to switch to the shutdown state.

[0152] In some embodiments, the system configuration parameters also include an upper limit value and a lower limit value of the power of the first battery 12 (corresponding to the first lower limit value of the power in the subsequent embodiments of the present application). The upper limit value and the first lower limit value of the power of the first battery 12 can be represented by the state of charge (SOC) value. The SOC value refers to the ratio of the current remaining power of the battery to the power in a fully charged state, usually expressed as a percentage. In some embodiments, the upper limit value of the power of the first battery 12 (expressed as the SOC value) is configured to be 90-95%, and the first lower limit value (expressed as the SOC value) is configured to be 5-10%.

[0153] In some embodiments, the system configuration parameters also include the upper limit of the charging power and the lower limit of the discharging power of the first energy storage inverter 11. The upper limit of the charging power refers to the maximum power value that the first energy storage inverter 11 can accept and process in the charging mode. In other words, it refers to the maximum input power that the first battery 12 can withstand during the charging process. The lower limit of the discharging power refers to the minimum power value that the first energy storage inverter 11 can provide in the discharging mode. In other words, it refers to the minimum power level that the first battery 12 can reach when releasing electrical energy to the grid or load.

[0154] In some embodiments, the system configuration parameters also include a charging power adjustment step and a discharging power adjustment step. The charging power adjustment step is the maximum increment or change range of each adjustment when the first energy storage inverter 11 controls the charging power. In short, it is the maximum change that can be taken when adjusting the charging power. The discharging power adjustment step is the maximum increment or change range of each adjustment when the first energy storage inverter 11 controls the discharging power. In short, it is the maximum change that can be taken when adjusting the discharging power. The charging power adjustment step and the discharging power adjustment step may be the same or different, and may be set according to the actual application scenario. The embodiments of the present application do not impose specific restrictions on this.

[0155] In some embodiments, the system configuration parameters also include the upper limit of the total power of the microgrid park system. The upper limit of the total power of the microgrid park system is the maximum demand of the microgrid park system in the current month, specifically the maximum value of the average load per unit time within a certain period of time (usually within an electricity bill settlement cycle). In some embodiments, the maximum demand refers to the average maximum load (in kilowatts) within 15 minutes. Among them, by combining the maximum demand of the microgrid park system in the current month, the purpose of correspondingly controlling the microgrid park system in combination with the real-time power of the load can be achieved.

[0156] Then, the specific implementation process of determining the first time period type corresponding to the current moment in step 21 includes step 32: determining the first time period type corresponding to the current moment according to the system configuration parameters.

[0157] That is, according to the system configuration parameters, it can be directly obtained whether the current moment corresponds to the off-peak period, normal period, peak period or peak period.

[0158] Afterwards, in step 23, the specific implementation process of adjusting the operating state of the first energy storage converter and adjusting the charging process or discharging process of the first battery according to the first time period type, the current operating state of the first energy storage converter and the first power includes the following method steps:

[0159] Step 231: Determine the remaining duration of the first time period type and the second time period type, wherein the second time period type is the next time period type after the first time period type ends.

[0160] The remaining duration of the first time period type is the duration from the current moment to the moment when the first time period type ends. In other words, starting from the current moment, after the remaining duration, the next time period type (recorded as the second time period type) is entered. For example, if the first time period type corresponding to the current moment is a valley period, the remaining duration is T1, and the second time period type is a normal period, then starting from the current moment, after T1 duration, the normal period is entered.

[0161] Step 232: When the first time period type is a valley period or a normal period, determine an upper limit value of the amount of electricity charged by the first battery connected to the first energy storage converter based on system configuration parameters.

[0162] Step 233: adjusting the operating state of the first energy storage inverter and the charging process of the first battery according to the system configuration parameters, the second time period type, the current operating state of the first energy storage inverter, the first power, the upper limit of power and the remaining time.

[0163] Specifically, the first battery 12 can be allowed to be charged during valley or normal periods, but not allowed to be discharged, so that electric energy can be stored when the pressure on the power grid is relatively low for subsequent use, such as using the energy stored in the first battery 12 during subsequent peak periods, reducing dependence on the power grid, thereby alleviating the pressure on the power grid during peak periods. Therefore, the upper limit of the power of the first battery 12 can be determined first to help determine how to adjust the power of the first battery 12 (for example, determining whether the first battery 12 needs to be charged).

[0164] During off-peak or normal periods, the microgrid park system 1000 is controlled accordingly based on the charging status and power level of the first battery 12, the operating status of the first energy storage inverter 11, etc., so that energy can be allocated in combination with the actual operating status of the microgrid park system 1000, thereby achieving more efficient use of the energy in the microgrid park system 1000, which is beneficial to improving energy utilization.

[0165] In one embodiment, if Figure 4 As shown, in step 233, according to the system configuration parameters, the second time period type, the current operating state of the first energy storage inverter, the first power, the upper limit of power and the remaining time, the specific implementation process of adjusting the operating state of the first energy storage inverter and the charging process of the first battery includes the following steps: When the first time period type is a valley period, and the current operating state of the first energy storage inverter 11 is a shutdown state (ie, step 41), first determine whether the remaining time is less than the preset time (ie, step 42) to determine whether the current valley period is nearing the end. Among them, the preset time is a pre-set time, which can be set based on the actual application scenario, such as 5 minutes, and the embodiment of the present application does not impose specific restrictions on this. The following three situations are included later:

[0166] The first case: if the remaining time is less than the preset time, and the second time period type is one of the following three types: peak time, peak time, and normal time period determined based on system configuration parameters to allow the first battery 12 to charge (i.e., step 43), then the first energy storage converter 11 is adjusted to switch to the power-on state (i.e., step 44) to start the first energy storage converter 11 in advance. It can be understood that if the first energy storage converter 11 is turned on in the second time period type, since it takes a certain amount of time for the first energy storage converter 11 to start and work normally, it may cause power waste during this period due to untimely scheduling of power. It can be seen that the present application can control the first battery 12 to discharge or charge immediately in the second time period type by turning on the first energy storage converter 11 in advance, which is conducive to avoiding power waste. Among them, the normal time period determined based on the system configuration parameters to allow the first battery 12 to charge refers to any normal time period, and when in the normal time period, it is determined based on the system configuration parameters to allow the first battery 12 to charge.

[0167] The second case: if the remaining time is less than the preset time, and the second time period type does not meet any of the above three conditions (i.e., step 45), the operation state of the first energy storage converter 11 is controlled to remain in the shutdown state (i.e., step 46). This is because when any of the above three conditions is not met, even if the second time period type is entered, the first energy storage converter 11 does not need to control the first battery 12 to discharge or charge, and in this case, the first energy storage converter 11 can be kept in the shutdown state.

[0168] The third case: if the remaining time is greater than or equal to the preset time, and the power is less than the upper limit value (i.e., step 47), it is determined that the first battery 12 can be charged at present. Then, the first energy storage converter 11 is adjusted to switch to the on state to control the first battery 12 to charge, so as to store electric energy for subsequent use.

[0169] In this embodiment, if the following four conditions are configured: condition 1, the remaining time is less than the preset time; condition 2, the second time period type is a peak time period or a peak time period; condition 3, the second time period type is a normal time period determined based on the system configuration parameters to allow the first battery to charge; condition 4, the first power is less than the upper limit of the power. Then the first situation above corresponds to: if any one of condition 2 and condition 3 is met while condition 1 is met (that is, condition 1 is met, and any one of condition 2 and condition 3 is met), then the first energy storage converter 11 is adjusted to switch to the power-on state; the second situation corresponds to: if condition 4 is met while condition 1 is not met (that is, condition 1 is not met, and condition 4 is met), then the first energy storage converter 11 is adjusted to switch to the power-on state; the third situation corresponds to: if condition 2 and condition 3 are not met while condition 1 is met (that is, condition 1 is met, and condition 2 and condition 3 are not met), then the operation state of the first energy storage converter 11 is controlled to remain in the power-off state.

[0170] In one embodiment, if Figure 5 As shown, in step 233, the specific implementation process of adjusting the operating state of the first energy storage inverter and the charging process of the first battery according to the system configuration parameters, the second time period type, the current operating state of the first energy storage inverter, the first power, the upper limit value of power and the remaining time includes the following steps: When the first time period type is a valley period and the current operating state of the first energy storage inverter 11 is the power-on state (ie, step 51), first determine whether the first power is greater than the upper limit value of power or is within the first preset interval (ie, step 52). Among them, the first preset interval is a power interval with the upper limit value of power as the center point and the left and right endpoints symmetrical relative to the center point. The left and right endpoints of the power interval can be set based on the actual application scenario, and the embodiment of the present application does not impose specific restrictions on this. The following three situations are included later:

[0171] The first case: if the first power is greater than the power upper limit or is within the first preset interval, it is determined that the first battery 12 has been fully charged, and the power of the first energy storage converter 11 should be adjusted to zero (i.e., the first part of step 53) so that the first battery 12 is neither charged nor discharged. Among them, if the power of the first energy storage converter 11 is already zero, it remains unchanged; if the power of the first energy storage converter 11 is not zero, the power is adjusted to zero. And, in some embodiments, the power can be adjusted to zero according to the maximum adjustment step. After that, the operating state of the first energy storage converter 11 is adjusted according to the system configuration parameters (i.e., the latter part of step 53). In some embodiments, the specific implementation of adjusting the operating state of the first energy storage converter 11 according to the system configuration parameters is: if it is determined according to the system configuration parameters that the first energy storage converter 11 is allowed to shut down, the operating state of the first energy storage converter 11 is controlled to switch to the shutdown state to reduce the no-load loss.

[0172] The second case: if the first power level is less than the power upper limit value, and the first power level is not within the first preset interval, and the remaining time is less than the preset time, and the second time period type is one of the following three types: peak time period, peak time period, and normal time period (i.e., step 54) in which the first battery 12 is not allowed to be charged and the first energy storage inverter 11 is allowed to stop running based on the system configuration parameters, it can be determined that the first battery 12 is not fully charged, and the first battery 12 can only be discharged under the above three time period types. In this case, the power of the first battery 12 should be maintained as much as possible for subsequent use. Therefore, in this case, the power of the first energy storage inverter 11 should be adjusted to zero when it is not zero, and the operating state of the first energy storage inverter 11 should be adjusted according to the system configuration parameters after the power is zero (i.e., step 53). The specific implementation process has been explained in the above first case and will not be repeated here.

[0173] The third case: if the first power level is less than the power upper limit value, and the first power level is not in the first preset interval, and the remaining time is greater than or equal to the preset time, it can be determined that the power of the first battery 12 is not fully charged, and there is enough time to charge the first battery 12. In this case, the first battery 12 should be controlled to be charged (i.e., step 55).

[0174] In this embodiment, if the following four conditions are configured: condition five, the first power is greater than the power upper limit or the first power is within the first preset interval; condition six, the remaining time is less than the preset time; condition seven, the second time period type is a normal period determined based on the system configuration parameters to not allow the first battery to be charged and the first energy storage converter to be stopped; condition eight, the second time period type is a peak period or a peak period. The first case above corresponds to: if condition five is met, the power of the first energy storage converter is adjusted to zero when it is not zero, and the operating state of the first energy storage converter is adjusted according to the system configuration parameters after the power is zero; the second case corresponds to: if condition five is not met and condition six is ​​met, and any one of condition seven and condition eight is met (that is, condition five is not met, condition six is ​​met, and any one of condition seven and condition eight is met), the power of the first energy storage converter is adjusted to zero when it is not zero, and the operating state of the first energy storage converter is adjusted according to the system configuration parameters after the power is zero; the third case corresponds to: if condition five and condition six are not met at the same time, the first battery 12 is controlled to charge.

[0175] In one embodiment, the system configuration parameters also include a charging power upper limit, a charging power adjustment step, and a total power upper limit of the microgrid park system. Figure 6 As shown, the specific implementation process of controlling the charging of the first battery 12 in step 55 includes the following steps:

[0176] Step 61: Determine a first target charging power of the first energy storage inverter according to the rated power, remaining time, first power and power upper limit of the first battery.

[0177] Step 62: Limit the target charging power according to the charging power upper limit and the total power upper limit, and limit the power adjustment amount according to the charging power adjustment step length to determine the second target charging power.

[0178] Step 63: If the following conditions are not met at the same time: the absolute value of the first target adjustment amount is less than the first preset adjustment interval; the second target charging power is greater than or equal to the current power, and the active power increase locking function of the energy storage system is triggered; the second target charging power is less than the current power, and the active power reduction locking function of the energy storage system is triggered, then the charging power of the first energy storage inverter is adjusted according to the first target adjustment amount, and the first battery is charged through the first energy storage inverter.

[0179] Specifically, the first target charging power P1 can be determined by the following formula: P1=K1(SOC2-SOC1)*C1 / T1, wherein SOC2 is the upper limit of the power, SOC1 is the first power, C1 is the rated power, T1 is the remaining time, and K1 is a charging coefficient greater than 1.

[0180] Next, if the first target charging power P1 is greater than the upper limit of charging power, the first target charging power P1 is limited to be equal to the upper limit of charging power; if the first target charging power P1 is less than or equal to the upper limit of charging power, the first target charging power P1 is kept unchanged, thereby achieving the limitation of the first target charging power according to the upper limit of charging power.

[0181] If the first target charging power P1 will cause the total power of the microgrid park system to be greater than the total power upper limit, the first target charging power P1 will be adjusted according to the total power upper limit, so that the total power limit of the microgrid park system is equal to the total power upper limit; if the first target charging power P1 will not cause the total power of the microgrid park system to be greater than the total power upper limit, the first target charging power P1 will remain unchanged, thereby achieving the limitation of the first target charging power P1 according to the total power upper limit.

[0182] Then, the power adjustment amount is limited according to the charging power adjustment step length, that is, the difference between the first target charging power P1 and the current power should be limited to be less than or equal to the charging power adjustment step length. The power adjustment amount is the specific value or amplitude for power adjustment.

[0183] After the above three limiting operations, the first target charging power is converted to the second target charging power, wherein the first target charging power may be equal to or may not be equal to the second target charging power.

[0184] Afterwards, if the absolute value of the first target adjustment amount is less than the first preset adjustment interval, it is determined that the amount of power adjustment required at this time is small and no adjustment is required to avoid frequent adjustments and improve the stability of the system. Among them, the first target adjustment amount is the difference between the second target charging power and the current power of the first energy storage inverter (that is, the power of the first energy storage inverter at the current moment). The first preset adjustment interval is a pre-set interval of power adjustment amount, which can be set based on the actual application scenario, and the embodiment of the present application does not impose specific restrictions on this.

[0185] If the second target charging power is greater than or equal to the current power, and the active power increase blocking function of the energy storage system is triggered, it is determined that the energy storage system has been restricted from increasing active power. Increasing power (increasing power when the second target charging power is greater than or equal to the current power) will conflict with the restrictions of the energy storage system, so in this case, the power will no longer be adjusted. Among them, when the active power increase blocking function of the energy storage system is triggered, the corresponding energy storage system prevents the increase of active power.

[0186] If the second target charging power is less than the current power, and the active power reduction blocking function of the energy storage system is triggered, it is determined that the energy storage system has been restricted from reducing active power. Then, reducing power (reducing power when the second target charging power is less than the current power) will conflict with the restrictions of the energy storage system, so in this case, the power will no longer be adjusted. Among them, when the active power reduction blocking function of the energy storage system is triggered, the corresponding energy storage system prevents the active power from being reduced.

[0187] On the contrary, if the following conditions are not met at the same time: the absolute value of the first target adjustment amount is less than the first preset adjustment interval; the second target charging power is greater than or equal to the current power, and the active power increase locking function of the energy storage system is triggered; the second target charging power is less than the current power, and the active power reduction locking function of the energy storage system is triggered, then the first target adjustment amount can be issued, that is, the charging power of the first energy storage inverter 11 is adjusted according to the first target adjustment amount, and the charging of the first battery 12 is controlled through the first energy storage inverter 11.

[0188] It should be noted that the active power increase blocking function and the active power reduction blocking function can be configured to be triggered based on the system frequency. This part of the content is a conventional technical means for those skilled in the art and will not be repeated here.

[0189] In one embodiment, if Figure 7As shown, in step 233, according to the system configuration parameters, the second time period type, the current operating state of the first energy storage converter, the first power, the upper limit of power and the remaining time, the specific implementation process of adjusting the operating state of the first energy storage converter and the charging process of the first battery includes the following steps: when the first time period type is a normal period and the current operating state of the first energy storage converter 11 is a shutdown state (i.e., step 71), first determine whether the first power is less than the upper limit of power (i.e., step 72) to determine whether the first battery 12 has been fully charged. Then, the following three situations are included:

[0190] The first case: if the first power level is less than the power upper limit value, and it is determined based on the system configuration parameters that the first battery 12 is allowed to charge, the first energy storage inverter 11 is adjusted to switch to the power-on state (ie, step 74) to turn on the first energy storage inverter 11 to control the first battery 12 to charge.

[0191] The second case: if the first power is greater than or equal to the power upper limit value, and the remaining time is less than the preset time, the first energy storage inverter 11 is adjusted to switch to the power-on state (i.e. step 74) to start the first energy storage inverter 11 in advance, so that the first energy storage inverter 11 can run directly after entering the second time period type.

[0192] The third case: If the first power level is greater than or equal to the power upper limit value, and the remaining time is greater than or equal to the preset time, then there is no need to charge the first battery 12 at this time, and the time to the second time period is still long, then in this case, keep the first energy storage inverter 11 in the off state.

[0193] In this embodiment, if the following three conditions are configured: condition nine, based on the system configuration parameters, determine that the first battery is allowed to charge; condition ten, the first power is less than the upper limit of the power; condition eleven, the remaining time is greater than or equal to the preset time. The first case above corresponds to: if both condition nine and condition ten are met, the first energy storage converter 11 is adjusted to switch to the power-on state; the second case corresponds to: if both condition ten and condition eleven are not met, the first energy storage converter 11 is adjusted to switch to the power-on state; the third case corresponds to: if condition ten is not met and condition eleven is met, the operating state of the first energy storage converter 11 is controlled to remain in the power-off state.

[0194] In one embodiment, if Figure 8As shown, in step 233, according to the system configuration parameters, the second time period type, the current operating state of the first energy storage inverter, the first power, the upper limit value of power and the remaining time, the specific implementation process of adjusting the operating state of the first energy storage inverter and the charging process of the first battery includes the following steps: when the first time period type is a normal period and the current operating state of the first energy storage inverter is a power-on state (i.e., step 51), first determine whether to allow the first battery 12 to charge based on the system configuration parameters.

[0195] Then, the follow-up includes the following three situations:

[0196] The first case: if it is determined based on the system configuration parameters that the first battery 12 is not allowed to charge, the power of the first energy storage converter 11 should be adjusted to zero (i.e., the first part of step 83) so that the first battery 12 is neither charged nor discharged. Among them, if the power of the first energy storage converter 11 is already zero, it remains unchanged; if the power of the first energy storage converter 11 is not zero, the power is adjusted to zero, and in some embodiments, the power can be adjusted to zero according to the maximum adjustment step. After that, the operating state of the first energy storage converter 11 is adjusted according to the system configuration parameters (i.e., the latter part of step 83). In some embodiments, the specific implementation of adjusting the operating state of the first energy storage converter 11 according to the system configuration parameters is: if it is determined according to the system configuration parameters that the first energy storage converter 11 is allowed to shut down, the operating state of the first energy storage converter 11 is controlled to switch to the shutdown state to reduce the no-load loss.

[0197] The second case: If it is determined based on the system configuration parameters that the first battery 12 is allowed to charge, and the first power level is greater than the upper limit value or is within the first preset interval, then since it can be determined that the first battery 12 has been fully charged, there is no need to charge the first battery 12 again. Then, when the power of the first energy storage inverter 11 is not zero, the power is adjusted to zero, and after the power is zero, the operating state of the first energy storage inverter 11 is adjusted according to the system configuration parameters (i.e., step 83). The specific implementation process has been explained in the first case above and will not be repeated here.

[0198] The third case: if it is determined based on the system configuration parameters that the first battery 12 is allowed to charge, and the first power level is less than the upper limit of the power level, and the first power level is not within the first preset interval, it can be determined that the first battery 12 is not fully charged and needs to be charged. In this case, the first battery 12 should be controlled to be charged (i.e., step 84).

[0199] In this embodiment, if the following two conditions are configured: Condition 12, based on the system configuration parameters, it is determined that the first battery is allowed to charge; Condition 13, the first power is greater than the upper limit of the power or the first power is within the first preset interval. The first case above corresponds to: if Condition 12 is not met, the power of the first energy storage converter is adjusted to zero when it is not zero, and the operating state of the first energy storage converter is adjusted according to the system configuration parameters after the power is zero; the second case corresponds to: if Condition 12 and Condition 13 are met at the same time, the power of the first energy storage converter is adjusted to zero when it is not zero, and the operating state of the first energy storage converter is adjusted according to the system configuration parameters after the power is zero; the third case corresponds to: if Condition 12 is met and Condition 13 is not met (that is, Condition 12 is met and Condition 13 is not met), the first battery is controlled to charge.

[0200] In one embodiment, the system configuration parameters also include a charging power upper limit, a charging power adjustment step, and a total power upper limit of the microgrid park system. The specific implementation process of controlling the charging of the first battery 12 in step 84 can also be achieved by Figure 6 Step 61, step 62 and step 63 are implemented as shown, and the specific implementation process is not repeated here.

[0201] Step 234: When the first time period type is a peak time period or a peak time period, determine a first power lower limit value and a second power lower limit value of the first battery discharge.

[0202] Step 235: Adjust the operating state of the first energy storage inverter and the discharge process of the first battery according to the system configuration parameters, the second time period type, the current operating state of the first energy storage inverter, the first power, the first power lower limit, the second power lower limit and the remaining time.

[0203] Specifically, the first battery 12 can be operated to discharge during peak hours or peak hours to reduce the pressure on the power grid during peak hours. Therefore, the first lower limit value of the first battery 12 and the second lower limit value of the first battery 12 can be determined first to help determine how to adjust the power of the first battery 12 (for example, determine whether the first battery 12 needs to be discharged). Among them, the first lower limit value of the power can be directly obtained from the system configuration parameters. When there is a peak period, it is necessary to give priority to the discharge power during the peak period, so as to maximize the discharge income during the peak period and reduce the energy cost of the industrial and commercial park as much as possible, and then set a preset power value (recorded as SOC3). In some embodiments, the preset power value is determined according to the rated power of the first energy storage converter 11 (recorded as P2), the total duration of the remaining peak period of the day (recorded as T2) and the total installed capacity of the energy storage system (in this embodiment, the maximum power of the first battery 12, recorded as C2), which can be determined by the following formula: SOC3 = K2*P2*T2 / C2*100. The second power lower limit value is the sum of the first power lower limit value and the preset power value.

[0204] For peak periods or spike periods, the microgrid park system 1000 is controlled accordingly based on the discharge state and power of the first battery 12, the operating state of the first energy storage inverter 11, etc., so that energy can be allocated in combination with the actual operating state of the microgrid park system 1000, thereby achieving more efficient use of the energy in the microgrid park system 1000, which is conducive to improving energy utilization.

[0205] In one embodiment, if Fig. 9 As shown, in step 235, according to the system configuration parameters, the second time period type, the current operating state of the first energy storage converter, the first power, the first power lower limit value, the second power lower limit value and the remaining time, the specific implementation process of adjusting the operating state of the first energy storage converter and the discharge process of the first battery includes the following steps: when the first time period type is a peak time period and the current operating state of the first energy storage converter is a shutdown state (i.e., step 91), first determine the relationship between the first power and the first power lower limit value and the second power lower limit value to determine the current discharge state of the first battery 12. Then, the following six situations may be included:

[0206] The first case: if the first power is greater than the second power lower limit (ie, step 92), the first energy storage converter 11 is adjusted to switch to the on state (ie, step 93) so as to be able to control the first battery 12 to discharge later.

[0207] The second situation: the first power is less than or equal to the second power lower limit, and the first power is greater than the first power lower limit (i.e., step 94), and the second time period type is not one of the following three: peak period, valley period, and normal period determined based on system configuration parameters to allow the first battery to be charged. Since the second time period type does not allow charging or discharging, the first energy storage inverter 11 can be kept in the off state.

[0208] The third situation: the first power is less than or equal to the second power lower limit, and the first power is greater than the first power lower limit, and the remaining time is less than the preset time. At the same time, the second time period type is one of the following three types: peak period, valley period, and normal period determined based on system configuration parameters to allow the first battery to be charged (i.e., step 95). Then, the first energy storage inverter 11 is adjusted to switch to the power-on state to start the first energy storage inverter 11 in advance, so that the first energy storage inverter 11 can run directly after entering the second time period type.

[0209] The fourth case: if the first power is less than or equal to the second power lower limit, and the first power is greater than the first power lower limit, and the remaining time is greater than or equal to the preset time, the first energy storage inverter 11 is kept in the shutdown state (step 99a).

[0210] The fifth situation: the first power is less than or equal to the first power lower limit value (step 97), and at the same time, the remaining time is less than the preset time, and the second time period type is a valley period or a normal period determined based on the system configuration parameters to allow the first battery to be charged (step 98), then the first energy storage inverter 11 is adjusted to switch to the power-on state to start the first energy storage inverter 11 in advance, so that after entering the second time period type, the first energy storage inverter 11 can directly operate and control the first battery 12 to charge.

[0211] The sixth situation: the first power is less than or equal to the first power lower limit value, and at the same time, at least one of the following two sub-situations is satisfied: the first sub-situation is that the remaining time is greater than or equal to the preset time (it can be determined that there is still a long time left before the peak period, and the first battery 12 has been discharged and can no longer be discharged); the second sub-situation is: the second time period type is not the following two: valley period, normal period determined based on system configuration parameters to allow the first battery to be charged (it can be determined that the second time period type does not allow charging). The above two sub-situations are the contents of step 99. In this case, the first energy storage inverter 11 can be kept in the off state.

[0212] In this embodiment, if the following five conditions are configured: Condition seventeen, the first power is greater than the second power lower limit; Condition eighteen, the first power is less than or equal to the first power lower limit; Condition nineteen, the remaining time is less than the preset time; Condition twenty, the second time period type is a valley period or a normal period determined based on system configuration parameters to allow the first battery to charge; Condition twenty-one, the second time period type is a peak period, then the first situation above corresponds to: if condition seventeen is met, the first energy storage inverter 11 is adjusted to switch to the power-on state; the second situation corresponds to: if conditions seventeen, eighteen, twenty and twenty-one are not met at the same time, the first energy storage inverter 11 is controlled to remain in the power-off state; the third situation corresponds to: if conditions seventeen and eighteen are not met and condition nineteen is met, Any one of condition 20 and condition 21 (that is, condition 17 and condition 18 are not met, and condition 19 is met, and any one of condition 20 and condition 21 is met), the first energy storage converter 11 is adjusted to switch to the power-on state; the fourth situation corresponds to: if condition 17, condition 18 and condition 19 are not met at the same time, the first energy storage converter is controlled to remain in the power-off state; the fifth state corresponds to: if condition 18, condition 19 and condition 20 are met at the same time, the first energy storage converter is adjusted to switch to the power-on state; the sixth state corresponds to: if at least one of condition 19 and condition 20 is not met while condition 18 is met (that is, condition 18 is met, and at least one of condition 19 and condition 20 is not met), the first energy storage converter is controlled to remain in the power-off state.

[0213] In one embodiment, if Fig.10 As shown, in step 235, according to the system configuration parameters, the second time period type, the current operating state of the first energy storage inverter, the first power, the first power lower limit value, the second power lower limit value and the remaining time, the specific implementation process of adjusting the operating state of the first energy storage inverter and the discharge process of the first battery includes the following steps: When the first time period type is a peak time period and the current operating state of the first energy storage inverter is the power-on state (i.e., step 101), first determine whether the first power is less than the second power lower limit value or is within the second preset interval (i.e., step 102) to determine whether the first battery 12 has been discharged. Among them, the second preset interval is a power interval with the second power lower limit value as the center point and the left and right endpoints symmetrical relative to the center point. The left and right endpoints of the power interval can be set based on the actual application scenario, and the embodiment of the present application does not impose specific restrictions on this. Then, the following four situations are included:

[0214] The first case: if the first power is less than the second power lower limit or the first power is within the second preset interval, it is determined that the first battery 12 has been discharged. At this time, the power of the first energy storage converter 11 should be adjusted to zero (i.e., the first part of step 103) so that the first battery 12 is neither charged nor discharged. Among them, if the power of the first energy storage converter 11 is zero, it remains unchanged; if the power of the first energy storage converter 11 is not zero, the power is adjusted to zero. And, in some embodiments, the power can be adjusted to zero according to the maximum adjustment step. After that, the operating state of the first energy storage converter 11 is adjusted according to the system configuration parameters (i.e., the latter part of step 103). In some embodiments, the specific implementation of adjusting the operating state of the first energy storage converter 11 according to the system configuration parameters is: if it is determined according to the system configuration parameters that the first energy storage converter 11 is allowed to shut down, the operating state of the first energy storage converter 11 is controlled to switch to the shutdown state to reduce the no-load loss.

[0215] The second situation: the first power is greater than or equal to the second power lower limit, and the first power is not in the second preset interval, and the next moment is a peak period, then the power of the first energy storage inverter 11 is controlled to remain unchanged (ie step 104), and directly enters the peak period for discharge.

[0216] The third case: the first electric quantity is greater than or equal to the second electric quantity lower limit, and the first electric quantity is not within the second preset interval, and the next moment is not a peak period, and the second period is not a peak period. At the same time, the remaining time is equal to the time for adjusting the power to zero (i.e., step 106). It is determined that there is sufficient time to adjust the power to zero during the current peak period. At this time, when the power of the first energy storage inverter 11 is not zero, the power is adjusted to zero, and after the power is zero, the operating state of the first energy storage inverter 11 is adjusted according to the system configuration parameters (i.e., step 103). The specific implementation process has been explained in the first case above and will not be repeated here.

[0217] The fourth situation: the first power is greater than or equal to the second power lower limit, and the first power is not in the second preset interval, and the next moment is not a peak period, and the second period is not a peak period. At the same time, the remaining time is less than the time for adjusting the power to zero, then it is determined that the power cannot be adjusted to zero during the current peak period, then the power of the first energy storage inverter 11 is directly reduced when the power of the first energy storage inverter 11 is not zero (ie step 108) to reduce the power of the first energy storage inverter 11 as much as possible.

[0218] The fifth case: the first power is greater than or equal to the second power lower limit, and the first power is not in the second preset interval, and the next moment is not a peak period, and the second period is not a peak period. At the same time, the remaining time is greater than the time to adjust the power to zero. It is determined that there is sufficient time to adjust the power to zero in the current peak period, and the current moment is not the time to start reducing the power (only the moment corresponding to the third situation is the time to start reducing the power). At this time, since the first power is large, it can still be discharged to reduce the pressure on the power grid.

[0219] In this embodiment, if the following five conditions are configured: Condition 22, the first power is less than the second power lower limit, or the first power is within the second preset interval; Condition 23, the next moment is in the peak period; Condition 24, the second period type is a peak period; Condition 25, the remaining time is equal to the time to adjust the power to zero; Condition 26, the remaining time is greater than the time to adjust the power to zero, then the first situation above corresponds to: if Condition 22 is met, the power is adjusted to zero when the power of the first energy storage inverter 11 is not zero, and the operating state of the first energy storage inverter 11 is adjusted according to the system configuration parameters after the power is zero; the second situation corresponds to: when Condition 22 is not met and Condition 23 is met (that is, Condition 22 is not met and Condition 23 is met), the control power remains unchanged; the third situation corresponds to : If condition twenty-five is met while condition twenty-two, condition twenty-three and condition twenty-four are not met (that is, condition twenty-two, condition twenty-three and condition twenty-four are not met, and condition twenty-five is met), then when the power of the first energy storage inverter 11 is not zero, the power is adjusted to zero, and after the power is zero, the operating state of the first energy storage inverter 11 is adjusted according to the system configuration parameters; the fourth situation corresponds to: if condition twenty-two, condition twenty-three, condition twenty-four, condition twenty-five and condition twenty-six are not met at the same time, then when the power of the first energy storage inverter 11 is not zero, the power is reduced; the fifth situation corresponds to: if condition twenty-two, condition twenty-three and condition twenty-four are not met while condition twenty-six is ​​met (that is, condition twenty-two, condition twenty-three and condition twenty-four are not met, and condition twenty-six is ​​met), then the first battery 12 is controlled to discharge.

[0220] In one embodiment, the system configuration parameters also include a discharge power lower limit and a discharge power adjustment step size. The first time period type is a peak time period. Fig.11 As shown, the specific implementation process of controlling the discharge of the first battery 12 in step 110 includes the following steps:

[0221] Step 111: Determine a first target discharge power of the first energy storage inverter according to the rated power, the remaining time, the first power and the second power upper limit of the first battery.

[0222] Step 112: limiting the first target discharge power according to the discharge power lower limit, limiting the power adjustment amount according to the discharge power adjustment step, and configuring the sum of the load power and the first target discharge power to be greater than zero to determine the second target discharge power.

[0223] Step 113: If the following conditions are not met at the same time: the absolute value of the second target adjustment amount is less than the second preset adjustment interval; the second target discharge power is greater than or equal to the current power, and the active power increase locking function of the energy storage system is triggered; the second target adjustment power is less than the current power, and the active power reduction locking function of the energy storage system is triggered, then the discharge power of the first energy storage inverter is adjusted according to the second target adjustment amount, and the discharge of the first battery is controlled through the first energy storage inverter.

[0224] Specifically, the first target discharge power P3 can be determined by the following formula: P3=K3(SOC4-SOC1)*C1 / T1, wherein SOC4 is the second lower limit of power, SOC1 is the first power, C1 is the rated power, T1 is the remaining time, and K3 is a charging coefficient greater than 1.

[0225] Then, if the first target discharge power P3 is less than the discharge power lower limit, the first target discharge power P3 is limited to be equal to the discharge power lower limit; if the first target discharge power P3 is greater than or equal to the discharge power lower limit, the first target discharge power P3 is kept unchanged, thereby achieving the limitation of the first target discharge power P3 according to the discharge power lower limit.

[0226] The power adjustment amount is then limited according to the discharge power adjustment step length, that is, the difference between the first target discharge power P3 and the current power should be limited to be less than or equal to the discharge power adjustment step length.

[0227] Afterwards, check whether the first target discharge power P3 will cause the microgrid park system to send power back to the grid. If it is determined that the first target discharge power P3 will not cause the microgrid park system to send power back to the grid, it remains unchanged. Otherwise, it is necessary to limit the first target discharge power P3 by configuring the sum of the load power and the first target discharge power to be greater than zero. Among them, by checking whether the first target discharge power P3 will cause the microgrid park system to send power back to the grid, the purpose of controlling the microgrid park system accordingly in combination with the real-time power of the load can be achieved.

[0228] After the above three limiting operations, the first target discharge power is converted into the second target discharge power, wherein the first target discharge power may be equal to or may not be equal to the second target discharge power.

[0229] Afterwards, if the absolute value of the second target adjustment amount is less than the second preset adjustment interval, it is determined that the power adjustment amount required at this time is small and no adjustment is required to avoid frequent adjustment and improve the stability of the system. Among them, the second target adjustment amount is the difference between the second target discharge power and the current power of the first energy storage inverter. The second preset adjustment interval is a pre-set power adjustment amount interval, which can be set based on the actual application scenario, and the embodiment of the present application does not impose specific restrictions on this.

[0230] If the second target discharge power is greater than or equal to the current power, and the active power increase locking function of the energy storage system is triggered, it is determined that the energy storage system is restricted from increasing active power at this time. Increasing power (power will be increased when the second target discharge power is greater than or equal to the current power) will conflict with the restriction of the energy storage system, so the power will no longer be adjusted in this case.

[0231] If the second target discharge power is less than the current power and the active power reduction locking function of the energy storage system is triggered, it is determined that the energy storage system has been restricted and no longer reduces the active power. Then reducing the power (the power will be reduced when the second target discharge power is less than the current power) will conflict with the restriction of the energy storage system, so in this case the power will no longer be adjusted.

[0232] On the contrary, if the following conditions are not met at the same time: the absolute value of the second target adjustment amount is less than the second preset adjustment interval; the second target discharge power is greater than or equal to the current power, and the active power increase locking function of the energy storage system is triggered; the second target discharge power is less than the current power, and the active power reduction locking function of the energy storage system is triggered, then the second target adjustment amount can be issued, that is, the discharge power of the first energy storage inverter 11 is adjusted according to the second target adjustment amount, and the discharge of the first battery 12 is controlled through the first energy storage inverter 11.

[0233] In one embodiment, if Fig.12 As shown, in step 235, according to the system configuration parameters, the second time period type, the current operating state of the first energy storage converter, the first power, the first power lower limit, the second power lower limit and the remaining time, the specific implementation process of adjusting the operating state of the first energy storage converter and the discharge process of the first battery includes the following steps: when the first time period type is a peak time period and the current operating state of the first energy storage converter is a power-on state (i.e., step 121), first determine whether the first power is greater than the first power lower limit (step 122) to determine the current discharge state of the first battery 12. Then, the following three situations may be included:

[0234] The first case: if the first power level is greater than the first power lower limit, the first energy storage converter 11 is adjusted to switch to the on state (ie, step 123 ) so as to be able to control the first battery 12 to discharge later.

[0235] The second situation: the first power is less than or equal to the first power lower limit value, and at the same time, the remaining time is less than the preset time, and the second time period type is a valley period or a normal period determined based on system configuration parameters to allow the first battery to be charged (step 124), then the first energy storage inverter 11 is adjusted to switch to the power-on state to start the first energy storage inverter 11 in advance, so that the first energy storage inverter 11 can run directly after entering the second time period type.

[0236] The third situation: the first power is less than or equal to the first power lower limit value, and at the same time, one of the following two sub-situations is satisfied: the first sub-situation is that the remaining time is greater than or equal to the preset time (i.e., step 125, which can determine that there is still a long time left before the peak period, and the first battery 12 has been discharged and can no longer be discharged); the second sub-situation is that the second time period type is neither a valley period nor a normal period determined based on system configuration parameters to allow the first battery to be charged (i.e., step 127, which can determine that the second time period type does not allow charging). In this case, the first energy storage inverter 11 can be kept in the off state.

[0237] In this embodiment, if the following three conditions are configured: condition 30, the first power is greater than the first power lower limit; condition 31, the remaining time is less than the preset time; condition 32, the second time period type is a valley period or a normal period determined based on the system configuration parameters to allow the first battery 12 to charge. Then the first case above corresponds to: if condition 30 is met, the first energy storage converter 11 is adjusted to switch to the power-on state; the second case corresponds to: if condition 31 and condition 32 are met while condition 30 is not met, the first energy storage converter 11 is adjusted to switch to the power-on state; the third case corresponds to: if condition 30 is not met while condition 31 and condition 32 are not met while condition 30 is not met, at least one of condition 31 and condition 32 is not met, the first energy storage converter 11 is controlled to remain in the power-off state.

[0238] In one embodiment, if Fig.13 As shown, in step 235, according to the system configuration parameters, the second time period type, the current operating state of the first energy storage inverter, the first power, the first power lower limit value, the second power lower limit value and the remaining time, the specific implementation process of adjusting the operating state of the first energy storage inverter and the discharge process of the first battery includes the following steps: When the first time period type is a peak period and the current operating state of the first energy storage inverter is the power-on state (ie, step 131), first determine whether the first power is less than the first power lower limit value or is within the third preset interval (ie, step 132) to determine whether the first battery 12 has been discharged. Among them, the second preset interval is a power interval with the first power lower limit value as the center point and the left and right endpoints symmetrical relative to the center point. The left and right endpoints of the power interval can be set based on the actual application scenario, and the embodiment of the present application does not impose specific restrictions on this. Then, the following four situations are included:

[0239] The first case: if the first power is less than the first power lower limit or the first power is within the third preset interval, it is determined that the first battery 12 has been discharged. At this time, the power of the first energy storage converter 11 should be adjusted to zero (i.e., the first part of step 133) so that the first battery 12 is neither charged nor discharged. Among them, if the power of the first energy storage converter 11 is zero, it remains unchanged; if the power of the first energy storage converter 11 is not zero, the power is adjusted to zero. And, in some embodiments, the power can be adjusted to zero according to the maximum adjustment step. After that, the operating state of the first energy storage converter 11 is adjusted according to the system configuration parameters (i.e., the latter part of step 133). In some embodiments, the specific implementation of adjusting the operating state of the first energy storage converter 11 according to the system configuration parameters is: if it is determined according to the system configuration parameters that the first energy storage converter 11 is allowed to shut down, the operating state of the first energy storage converter 11 is controlled to switch to the shutdown state to reduce the no-load loss.

[0240] The second case: the first power is greater than or equal to the first power lower limit, and the first power is not in the third preset interval, and the next moment is in the peak period, then the power of the first energy storage inverter 11 is controlled to remain unchanged (ie step 134), and directly enters the peak period for discharge.

[0241] The third case: the first power is greater than or equal to the first power lower limit, and the first power is not within the third preset interval, and the next moment is not in the peak period, and the second period is not a peak period. At the same time, the remaining time is equal to the time to adjust the power to zero (i.e., step 136). It is determined that there is sufficient time to adjust the power to zero in the current peak period. At this time, when the power of the first energy storage inverter 11 is not zero, the power is adjusted to zero, and after the power is zero, the operating state of the first energy storage inverter 11 is adjusted according to the system configuration parameters (i.e., step 133). The specific implementation process has been explained in the first case above and will not be repeated here.

[0242] The fourth situation: the first power is greater than or equal to the first power lower limit value, and the first power is not in the third preset interval, and the next moment is not in the peak period, and the second period is not a peak period. At the same time, the remaining time is less than the time for adjusting the power to zero (i.e., step 137), then it is determined that the power cannot be adjusted to zero during the current peak period, then the power of the first energy storage inverter 11 is directly reduced when the power of the first energy storage inverter 11 is not zero (i.e., step 138) to reduce the power of the first energy storage inverter 11 as much as possible.

[0243] The fifth situation: the first power is greater than or equal to the first power lower limit, and the first power is not in the third preset interval, and the next moment is not in the peak period, and the second period is not a peak period. At the same time, the remaining time is greater than the time to adjust the power to zero. It is determined that there is sufficient time to adjust the power to zero during the current peak period, and the current moment is not the time to start reducing the power (only the moment corresponding to the third situation is the time to start reducing the power). At this time, since the first power is large, it can still be discharged to reduce the pressure on the power grid.

[0244] In this embodiment, if the following five conditions are configured: condition thirty-three, the first power is less than the first power lower limit, or the first power is within the third preset interval; condition thirty-four, the next moment is in the peak period; condition thirty-five, the second period type is the peak period; condition thirty-six, the remaining time is equal to the time for adjusting the power to zero; condition thirty-seven, the remaining time is greater than the time for adjusting the power to zero, then the first case above corresponds to: if condition thirty-three is met, the power is adjusted to zero when the power of the first energy storage converter 11 is not zero, and the operating state of the first energy storage converter 11 is adjusted according to the system configuration parameters after the power is zero; the second case corresponds to: when condition thirty-three is not met and condition thirty-four is met (that is, condition thirty-three is not met and condition thirty-four is met), the control power remains unchanged; the third case corresponds to: If condition thirty-six is ​​satisfied while condition thirty-three, condition thirty-four and condition thirty-five are not satisfied (i.e. condition thirty-three, condition thirty-four and condition thirty-five are not satisfied, and condition thirty-six is ​​satisfied), then when the power of the first energy storage inverter 11 is not zero, the power is adjusted to zero, and after the power is zero, the operating state of the first energy storage inverter 11 is adjusted according to the system configuration parameters; the fourth situation corresponds to: if condition thirty-three, condition thirty-four, condition thirty-five, condition thirty-six and condition thirty-seven are not satisfied at the same time, then when the power of the first energy storage inverter 11 is not zero, the power is reduced; the fifth situation corresponds to: if condition thirty-three, condition thirty-four and condition thirty-five are not satisfied while condition thirty-seven is satisfied (i.e. condition thirty-three, condition thirty-four and condition thirty-five are not satisfied, and condition thirty-seven is satisfied), then the first battery 12 is controlled to discharge.

[0245] In one embodiment, the system configuration parameters also include a discharge power lower limit and a discharge power adjustment step size. The first time period type is a peak time period. Fig.14 As shown, the specific implementation process of controlling the discharge of the first battery 12 in step 140 includes the following steps:

[0246] Step 141: Determine a first target discharge power of the first energy storage inverter according to the rated power, the remaining time, the first power and the first power upper limit of the first battery.

[0247] Step 142: limiting the third target discharge power according to the discharge power lower limit, limiting the power adjustment amount according to the discharge power adjustment step, and configuring the sum of the load power and the third target discharge power to be greater than zero to determine the fourth target discharge power.

[0248] Step 143: If the following conditions are not met at the same time: the absolute value of the third target adjustment amount is less than the third preset adjustment interval; the fourth target discharge power is greater than or equal to the current power, and the active power increase locking function of the energy storage system is triggered; the fourth target adjustment power is less than the current power, and the active power reduction locking function of the energy storage system is triggered, then the discharge power of the first energy storage inverter is adjusted according to the third target adjustment amount, and the discharge of the first battery is controlled through the first energy storage inverter.

[0249] Specifically, the third target discharge power P4 can be determined by the following formula: P4=K4(SOC5-SOC1)*C1 / T1, wherein SOC5 is the first lower limit of the power, SOC1 is the first power, C1 is the rated power, T1 is the remaining time, and K4 is a charging coefficient greater than 1.

[0250] Then, if the third target discharge power P4 is less than the discharge power lower limit, the third target discharge power P4 is limited to be equal to the discharge power lower limit; if the third target discharge power P4 is greater than or equal to the discharge power lower limit, the third target discharge power P4 is kept unchanged, thereby achieving the limitation of the third target discharge power P4 according to the discharge power lower limit.

[0251] The power adjustment amount is then limited according to the discharge power adjustment step length, that is, the difference between the third target discharge power P4 and the current power should be limited to be less than or equal to the discharge power adjustment step length.

[0252] Afterwards, check whether the third target discharge power P4 will cause the microgrid park system 1000 to send power back to the grid. If it is determined that the third target discharge power P4 will not cause the microgrid park system 1000 to send power back to the grid, it remains unchanged; otherwise, the third target discharge power P4 needs to be limited by configuring the sum of the load power and the third target discharge power P4 to be greater than zero.

[0253] After the above three limiting operations, the third target discharge power is converted into the fourth target discharge power, wherein the third target discharge power may be equal to or may not be equal to the fourth target discharge power.

[0254] Afterwards, if the absolute value of the third target adjustment amount is less than the third preset adjustment interval, it is determined that the power adjustment amount required at this time is small and no adjustment is required to avoid frequent adjustment and improve the stability of the system. Among them, the third target adjustment amount is the difference between the fourth target discharge power and the current power of the first energy storage inverter. The third preset adjustment interval is a pre-set power adjustment amount interval, which can be set based on the actual application scenario, and the embodiment of the present application does not impose specific restrictions on this.

[0255] If the fourth target discharge power is greater than or equal to the current power, and the active power increase locking function of the energy storage system is triggered, it is determined that the energy storage system has been restricted from increasing active power at this time. Increasing power (increasing power when the fourth target discharge power is greater than or equal to the current power) will conflict with the restriction of the energy storage system, so the power will no longer be adjusted in this case.

[0256] If the fourth target discharge power is less than the current power and the active power reduction locking function of the energy storage system is triggered, it is determined that the energy storage system has been restricted and no longer reduces the active power. Then, reducing the power (the power will be reduced when the fourth target discharge power is less than the current power) will conflict with the restriction of the energy storage system. Therefore, in this case, the power will no longer be adjusted.

[0257] On the contrary, if the following conditions are not met at the same time: the absolute value of the third target adjustment amount is less than the third preset adjustment interval; the fourth target discharge power is greater than or equal to the current power, and the active power increase locking function of the energy storage system is triggered; the fourth target discharge power is less than the current power, and the active power reduction locking function of the energy storage system is triggered, then the third target adjustment amount can be issued, that is, the discharge power of the first energy storage inverter 11 is adjusted according to the third target adjustment amount, and the discharge of the first battery 12 is controlled through the first energy storage inverter 11.

[0258] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

[0259] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them. Under the idea of ​​the present application, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order. It should be understood by ordinary technicians in this field that they can still modify the technical solutions recorded in the above embodiments, or replace some of the technical features by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A control method for a microgrid park system, It is characterized in that The microgrid park system includes an energy storage system and a load, the energy storage system includes at least one energy storage unit, the energy storage unit is connected to the load, the energy storage unit includes N energy storage converters and N batteries, each of the energy storage converters is connected to one of the batteries, wherein N is an integer greater than or equal to 1, and the method includes: Determine a first time period type corresponding to the current moment, wherein the first time period type includes a valley time period, a normal time period, a peak time period, and a peak time period; Obtaining a current operating state of a first energy storage converter among the N energy storage converters and a first power level of a first battery connected to the first energy storage converter, wherein the operating state includes a power-on state and a power-off state; According to the first time period type, the current operating state of the first energy storage inverter and the first power, the operating state of the first energy storage inverter is adjusted, and the charging process or the discharging process of the first battery is adjusted.

2. The method according to claim 1, It is characterized in that Before determining the first time period type corresponding to the current moment, the method further includes: receiving system configuration parameters, wherein the system configuration parameters include time periods corresponding to each time period type, whether the first battery is allowed to charge or discharge, and whether the operating state of the first energy storage converter is allowed to be switched to a shutdown state; The determining the first time period type corresponding to the current moment includes: determining the first time period type corresponding to the current moment according to the system configuration parameter; The step of adjusting the operating state of the first energy storage inverter and the charging process or discharging process of the first battery according to the first time period type, the current operating state of the first energy storage inverter and the first power includes: Determine the remaining duration of the first time period type and a second time period type, wherein the second time period type is the next time period type after the first time period type ends; When the first time period type is the valley time period or the normal time period, determining the upper limit value of the amount of electricity charged by the first battery connected to the first energy storage inverter based on the system configuration parameters, and adjusting the operating state of the first energy storage inverter and the charging process of the first battery according to the system configuration parameters, the second time period type, the current operating state of the first energy storage inverter, the first amount of electricity, the upper limit value of the amount of electricity, and the remaining time; When the first time period type is the peak time period or the spike time period, determine the first lower limit value and the second lower limit value of the first battery discharge, and adjust the operating state of the first energy storage inverter and the discharge process of the first battery according to the system configuration parameters, the second time period type, the current operating state of the first energy storage inverter, the first power, the first lower limit value, the second lower limit value and the remaining time, wherein the first lower limit value of the power is determined based on the system configuration parameters, and the second lower limit value of the power is the sum of the first lower limit value of the power and the preset power value.

3. The method according to claim 2, It is characterized in that The step of adjusting the operating state of the first energy storage inverter and the charging process of the first battery according to the system configuration parameter, the second time period type, the current operating state of the first energy storage inverter, the first power, the power upper limit value and the remaining time includes: When the first time period type is the valley time period, and the current operating state of the first energy storage converter is the shutdown state, the following steps are performed: If any one of condition 2 and condition 3 is satisfied while condition 1 is satisfied, or if condition 4 is satisfied while condition 1 is not satisfied, adjusting the first energy storage converter to switch to the power-on state; If condition 1 is met but condition 2 and condition 3 are not met, controlling the operating state of the first energy storage converter to remain in the shutdown state; Among them, condition 1: the remaining time is less than the preset time; Condition 2: the second time period type is the peak time period or the peak time period; Condition three: the second time period type is the normal time period during which the first battery is allowed to be charged, determined based on the system configuration parameters; Condition 4: the first power level is less than the power upper limit.

4. The method according to claim 2, It is characterized in that The step of adjusting the operating state of the first energy storage inverter and the charging process of the first battery according to the system configuration parameter, the second time period type, the current operating state of the first energy storage inverter, the first power, the power upper limit value and the remaining time includes: When the first time period type is the valley time period, and the current operating state of the first energy storage converter is the power-on state, the following steps are performed: If condition five is satisfied, or if condition five is not satisfied and condition six is ​​satisfied and any one of condition seven and condition eight is satisfied, then when the power of the first energy storage converter is not zero, the power is adjusted to zero, and after the power is zero, the operating state of the first energy storage converter is adjusted according to the system configuration parameters; If both condition 5 and condition 6 are not satisfied, controlling the first battery to charge; Among them, condition five, the first power is greater than the power upper limit value or the first power is within a first preset interval, wherein the first preset interval is a power interval with the power upper limit value as the center point and the left and right endpoints symmetrical relative to the center point; Condition 6: the remaining duration is less than the preset duration; Condition 7: The second time period type is a normal time period during which the first battery is not allowed to be charged and the first energy storage converter is allowed to stop operating, determined based on the system configuration parameters; Condition eight: the second time period type is the peak time period or the peak time period.

5. The method according to claim 2, It is characterized in that The step of adjusting the operating state of the first energy storage inverter and the charging process of the first battery according to the system configuration parameter, the second time period type, the current operating state of the first energy storage inverter, the first power, the power upper limit value and the remaining time includes: When the first time period type is the normal time period, and the current operating state of the first energy storage converter is the shutdown state, the following steps are performed: If condition nine and condition ten are satisfied at the same time, or condition ten and condition eleven are not satisfied at the same time, adjusting the first energy storage converter to switch to the power-on state; If condition 11 is met while condition 10 is not met, controlling the operating state of the first energy storage converter to remain in the shutdown state; Among them, condition nine: determining to allow the first battery to charge based on the system configuration parameters; Condition 10: the first power level is less than the power upper limit; Condition 11: The remaining duration is greater than or equal to the preset duration.

6. The method according to claim 2, It is characterized in that The step of adjusting the operating state of the first energy storage inverter and the charging process of the first battery according to the system configuration parameter, the second time period type, the current operating state of the first energy storage inverter, the first power, the power upper limit value and the remaining time includes: When the first time period type is the normal time period, and the current operating state of the first energy storage converter is the power-on state, the following steps are performed: If condition 12 is not satisfied, or condition 12 and condition 13 are satisfied at the same time, when the power of the first energy storage converter is not zero, the power is adjusted to zero, and after the power is zero, the operating state of the first energy storage converter is adjusted according to the system configuration parameters; If condition 12 is met but condition 13 is not met, controlling the first battery to charge; Condition 12: determining to allow charging of the first battery based on the system configuration parameters; Condition 13: the first power level is greater than the power upper limit or the first power level is within a first preset range.

7. The method according to claim 4 or 6, It is characterized in that The system configuration parameters also include a charging power upper limit, a charging power adjustment step, and a total power upper limit of the microgrid park system; The controlling the charging of the first battery comprises: Determine a first target charging power of the first energy storage inverter according to the rated power of the first battery, the remaining time, the first power and the power upper limit; limiting the target charging power according to the charging power upper limit and the total power upper limit, and limiting the power adjustment amount according to the charging power adjustment step, so as to determine a second target charging power; If condition fourteen, condition fifteen and condition sixteen are not met at the same time, the charging power of the first energy storage inverter is adjusted according to the first target adjustment amount, and the first battery is charged by the first energy storage inverter, wherein the first target adjustment amount is the difference between the second target charging power and the current power of the first energy storage inverter; Among them, condition fourteen: the absolute value of the first target adjustment amount is less than the first preset adjustment range; Condition 15: the second target charging power is greater than or equal to the current power, and the active power increase locking function of the energy storage system is triggered; Condition 16: the second target charging power is less than the current power, and the active power reduction locking function of the energy storage system is triggered.

8. The method according to claim 2, It is characterized in that The step of adjusting the operating state of the first energy storage inverter and the discharge process of the first battery according to the system configuration parameters, the second time period type, the current operating state of the first energy storage inverter, the first power, the first power lower limit, the second power lower limit and the remaining time includes: When the first time period type is the peak time period, and the current operating state of the first energy storage converter is the shutdown state, the following steps are performed: If condition 17 is satisfied, or condition 18, condition 19 and condition 20 are satisfied at the same time, or if condition 17 and condition 18 are not satisfied but condition 19 is satisfied and any one of condition 20 and condition 21 is satisfied, then the first energy storage converter is adjusted to switch to the power-on state; If at least one of condition 19 and condition 20 is not satisfied while condition 18 is satisfied, or condition 17, condition 18 and condition 19 are not satisfied at the same time, or condition 17, condition 18, condition 20 and condition 21 are not satisfied at the same time, then the first energy storage converter is controlled to remain in the shutdown state; Among them, condition seventeen, the first power is greater than the lower limit of the second power; Condition 18: the first power level is less than or equal to the first power level lower limit; Condition 19: the remaining time is less than the preset time; Condition 20: the second time period type is the valley time period or the normal time period during which the first battery is allowed to be charged, determined based on the system configuration parameters; Condition 21: The second time period type is the peak time period.

9. The method according to claim 2, It is characterized in that The step of adjusting the operating state of the first energy storage inverter and the discharge process of the first battery according to the system configuration parameters, the second time period type, the current operating state of the first energy storage inverter, the first power, the first power lower limit, the second power lower limit and the remaining time includes: When the first time period type is the peak time period, and the current operating state of the first energy storage converter is the startup state, the following steps are performed: If condition 22 is satisfied, or condition 25 is satisfied while condition 22, condition 23 and condition 24 are not satisfied, then when the power of the first energy storage converter is not zero, the power is adjusted to zero, and after the power is zero, the operating state of the first energy storage converter is adjusted according to the system configuration parameters; If condition 23 is met while condition 22 is not met, the power is controlled to remain unchanged; If condition 22, condition 23, condition 24, condition 25 and condition 26 are not met at the same time, when the power of the first energy storage converter is not zero, reducing the power; If condition 26 is met while condition 22, condition 23 and condition 24 are not met, controlling the first battery to discharge; Among them, condition 22, the first power is less than the second power lower limit, or the first power is within a second preset interval, wherein the second preset interval is a power interval with the second power lower limit as the center point and the left and right endpoints symmetrical relative to the center point; Condition 23: The next moment is in the peak period; Condition 24: the second time period type is the peak time period; Condition 25: The remaining time is equal to the time for adjusting the power to zero; Condition 26: The remaining time is greater than the time required to adjust the power to zero.

10. The method according to claim 9, It is characterized in that The system configuration parameters also include a discharge power lower limit and a discharge power adjustment step, and the first time period type is the peak time period; The controlling the first battery to discharge comprises: Determine a first target discharge power of the first energy storage converter according to the rated power of the first battery, the remaining time, the first power and the lower limit of the second power; limiting the first target discharge power according to the discharge power lower limit, limiting the power adjustment amount according to the discharge power adjustment step, and configuring the sum of the power of the load and the first target discharge power to be greater than zero, so as to determine the second target discharge power; If condition 27, condition 28 and condition 29 are not met at the same time, the discharge power of the first energy storage converter is adjusted according to the second target adjustment amount, and the discharge of the first battery is controlled by the first energy storage converter, wherein the second target adjustment amount is the difference between the second target discharge power and the current power of the first energy storage converter; Among them, condition 27: the absolute value of the second target adjustment amount is less than the second preset adjustment range; Condition 28: The second target discharge power is greater than or equal to the current power, and the active power increase locking function of the energy storage system is triggered; Condition 29: The second target regulated power is less than the current power, and the active power reduction locking function of the energy storage system is triggered.

11. The method according to claim 2, It is characterized in that The step of adjusting the operating state of the first energy storage inverter and the discharge process of the first battery according to the system configuration parameters, the second time period type, the current operating state of the first energy storage inverter, the first power, the first power lower limit, the second power lower limit and the remaining time includes: When the first time period type is the peak time period, and the current operating state of the first energy storage converter is the shutdown state, the following steps are performed: If condition 30 is satisfied, or if condition 31 and condition 32 are satisfied while condition 30 is not satisfied, adjusting the first energy storage converter to switch to the power-on state; If at least one of condition 31 and condition 32 is not satisfied while condition 30 is not satisfied, controlling the first energy storage converter to remain in the shutdown state; Among them, condition 30: the first power is greater than the first power lower limit; Condition 31: the remaining duration is less than the preset duration; Condition 32: The second time period type is the valley period or the normal period during which the first battery is allowed to charge based on the system configuration parameters.

12. The method according to claim 2, It is characterized in that The step of adjusting the operating state of the first energy storage inverter and the discharge process of the first battery according to the system configuration parameters, the second time period type, the current operating state of the first energy storage inverter, the first power, the first power lower limit, the second power lower limit and the remaining time includes: When the first time period type is the peak time period, and the current operating state of the first energy storage converter is the power-on state, the following steps are performed: If condition thirty-three is satisfied, or condition thirty-three, condition thirty-four and condition thirty-five are not satisfied and condition thirty-six is ​​satisfied, then when the power of the first energy storage converter is not zero, the power is adjusted to zero, and after the power is zero, the operating state of the first energy storage converter is adjusted according to the system configuration parameters; If condition 34 is met while condition 33 is not met, the power is controlled to remain unchanged; If condition 33, condition 34, condition 35, condition 36 and condition 37 are not satisfied at the same time, when the power of the first energy storage converter is not zero, reducing the power; If condition 37 is met while condition 33, condition 34 and condition 35 are not met, controlling the first battery to discharge; Among them, condition thirty-three, the first power is less than the first power lower limit, or the first power is within a third preset interval, wherein the third preset interval is a power interval with the first power lower limit as the center point and the left and right endpoints symmetrical relative to the center point; Condition 34: The next moment is in the peak period; Condition 35: the second time period type is the peak time period; Condition 36: The remaining time is equal to the time for adjusting the power to zero; Condition 37: The remaining duration is greater than the duration for adjusting the power to zero.

13. The method according to claim 12, It is characterized in that The system configuration parameters also include a discharge power lower limit and a discharge power adjustment step, and the first time period type is the peak time period; The controlling the first battery to discharge comprises: Determine a third target discharge power of the first energy storage converter according to the rated power of the first battery, the remaining time, the first power and the first power lower limit; The third target discharge power is limited according to the discharge power lower limit, and the power adjustment amount is limited according to the discharge power adjustment step, and the sum of the power of the load and the third target discharge power is configured to be greater than zero, so as to determine a fourth target discharge power; If condition 38, condition 39 and condition 40 are not met at the same time, the discharge power of the first energy storage inverter is adjusted according to the third target adjustment amount, and the discharge of the first battery is controlled by the first energy storage inverter, wherein the third target adjustment amount is the difference between the fourth target adjustment power and the current power of the first energy storage inverter: Among them, condition 38: the absolute value of the third target adjustment amount is less than the third preset adjustment interval; Condition 39: the fourth target regulated power is greater than or equal to the current power, and the active power increase locking function of the energy storage system is triggered; Condition 40: the fourth target regulated power is less than the current power, and the active power reduction locking function of the energy storage system is triggered.

14. A microgrid park system, It is characterized in that Including energy management system, energy storage system and load; The energy storage system includes at least one energy storage unit, the energy storage unit is connected to the load, the energy storage unit includes N energy storage converters and N batteries, each of the energy storage converters is connected to one of the batteries, wherein N is an integer greater than or equal to 1; The energy management system is connected to the energy storage system, and the energy management system is used to execute the control method of the microgrid park system as described in any one of claims 1-13.

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